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  • ASTROPHYSICS  (2)
  • 1
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    The absence of a color-distance trend in comets (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: New near-IR J-H and H-K observations of 23 comets have been obtained in the heliocentric distance range of 1 to 6 AU. No evidence is found for a color-distance trend in the present sample. Significant differences between the grain populations in different comets are pointed out. The results indicate that the color distributions are unimodal, and that, unlike asteroids, the comets cannot be classified into distinct color-defined groups.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 96; 1723-173
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Early photometry of comet p/Halley - Development of the coma (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The observation of comets over a large range of heliocentric distances can provide important information, taking into account, for instance, the appearance of true cometary characteristics. Photometric evidence is provided regarding coma formation at approximately 5.9 AU, giving attention to aspects of water-ice sublimation. New photometry of p/Halley was obtained when the comet was at 5.9 and 5.1 AU, during 1984 October and 1985 January, respectively. The new observations are compared with data obtained at larger heliocentric distances. It is argued that sustained mass loss from the nucleus began at about 5.9 AU, at a rate which is consistent with production by sublimation from a predominantly water-ice nucleus.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 66; 561-574
    Format: text
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    NASA TECHNICAL REPORTS
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